4　Electrical Connection

4.1　Modes of Connection

4.1.1　Individual shunt capacitor sub-banks may be firstly connected to the busbar and then to the transformer via the main circuit as shown in Figure 4.1.1-1 and Figure 4.1.1-2.Where power supply lines are provided in busbar of the same voltage level，the capacitors may be alternatively connected to the special busbar if justified through technical and economic analysis，as shown in Figure 4.1.1-3.

4.1.2　The wiring modes of shunt capacitor banks shall meet the following regulations:

Figure 4.1.1-1　Connection Mode in Cases Where No Power Supply Line is Provided in Busbar of the Same Voltage Level

1　The shunt capacitor banks shall be wye-connected.In the gird where its neutral point is not solidly grounded，the neutral point of the wye-connected capacitor banks shall not be grounded.

Figure 4.1.1-2　Connection Mode in Cases Where Power Supply Lines are Provided in Busbar of the Same Voltage Level

Figure 4.1.1-3　Connection Mode in Cases Where Exclusively-designed Busbars are Provided α capacitor busbar

2　Where each phase or bridge of the capacity banks comprises a number of capacitors that are connected both in series and in parallel，the connection should be made by means of parallel connection first，followed by series connection.

3　The total parallel-connected capacity of the capacitors of each series section shall not exceed 3900 kvar.

4.1.3　The low voltage shunt capacitors may share the same busbar with low voltage power supply cabinet.Low voltage capacitors and capacitor banks may be either delta-connected or wye-connected.